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Renewable Energy Calculators

Renewable Percentage Calculator

What share of your energy comes from renewable sources, and what is needed to reach a target.

Enter values

Results update as you type.

Result

Renewable share

55%

Grid energy still needed
1,800 kWh
Extra generation for the target
1,800 kWh
Extra solar capacity needed
2 kWp
at 900 kWh per kWp per year
CO₂ avoided
512.6 kg

About the Renewable Percentage Calculator

What share of your energy comes from renewable sources, and what is needed to reach a target.

Also known as: renewable share calculator, green energy percentage, clean energy mix, renewable target.

How to use this calculator

  1. Enter total energy use, renewable generation, target renewable share.
  2. The result updates instantly as you type — press Calculate (or Enter) at any time.
  3. Review the breakdown shown under the main result.
  4. Use Copy result or Share to save the answer or send a link with your inputs.

Formula

share = renewable ÷ total × 100

Worked example

Using the values pre-filled in the calculator above:

  • Total energy use = 4,000 kWh
  • Renewable generation = 2,200 kWh
  • Target renewable share = 100 %

the calculator returns:

  • Renewable share: 55%
  • Grid energy still needed: 1,800 kWh
  • Extra generation for the target: 1,800 kWh
  • Extra solar capacity needed: 2 kWp